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The paper deals with the investigation of secondary phases evolution during quenching, quenching and tempering in the high – chromium martensitic GX12CrMoVNbN9-1 (GP91) cast steel. It also includes the analysis of evolution of secondary phases in the as - cast condition and after stress relief annealing at the temperature of 750°C of the tempered GP91 cast steel.
The aim of the study was to determine the life characteristics of low-cycle P91 and P92 steels used in the power unit components that work under the highest effort. The life of the steels was determined for constant ranges of total strain from the range of Äĺt= 0.6-1.2% and with the application of gradual loading two-stage.
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